Improvement in bed-springs



UNITED STATES PATENT OFFI E.

MARSENA M. MURRAY, OF GIN GINNATI, OHIO.

IMPROVEMENT IN BED-SPRINGS.

To all whom it may concern.-

Be it known that I, MARSENA M. MURRAY,

' of Cincinnati, Hamilton county, Ohio, have invented an ImprovedBed-Spring, of which the following is a specification:

N aturc and Objects of the Invention.

This invention relates to that class of bedsprings which consistessentially of pairs of coils united by arms and webs or cross.bars,which serve to support the slats composing the bed-bottom. The inventionconsists in a peculiar construction of this form of spring, by which thecoils are elevated so as not to chafe by I means of positive supports,which serve also to insure uniformity in elevation and action, and toincrease the resiliency of the springs, and to constitute abutments forthe attachingstems, which extend through and are secured below thesupporting-rails. A cheap, simple, and secure mode of attaching andsecuring the uniformity of elevated springs is thus afforded,

and one which is free from projecting screws,

staples, or other extraneous devices.

General Description.

Figure 1 is a perspective view of a portion of a bed-bottom providedwith my improved form of spring; and Fig. 2 is a plan of the under sideof the supporting-rail, showing my preferred method of securing the endsof the springs to said rail-that is to say, by clinching in thedirection of the grain of the wood.

My spring consists essentially of two helicoidal members, A A, which,instead of bearing uponthe upper surface of the transverse rail H, areelevated some distance above the same so as never to come in contacttherewith, no matter how much the bed-bottom may be depressed.Projecting from the upper and inner coils of ,these helicoidal membersare two opposing and precisely similar arms, B B,

whose common cross bar or loop, 0, serves to sions begin at the lowerportions of the outer coils of the spring A A, at which points the wireis bent so as to take the shape of reverse curves E E, whose diametersmaybe nearly thoseof the aforesaid coils. The projection of these curvestoward the loop 0 may be varied according to the views of themanufacturer. In some cases said curves may be carried a considerabledistance toward the bar .0, or they may terminate in the same verticalplane as the coils A A, as shown in the illustrations. Projectin g fromthe lower portions of these reverse curves, and extending horizontallyback or away from the arms B B, are prolongations F F, which constitutethe bases of the springs.

These bases rest upon the upper surface of the transverse rail H of thebed-bottom, and are bent at right angles so as to form vertical shanks GG, which are driven into apertures h of said transverse rail. The shanksG G are long enough to project some distance below the bers never comein contact with said rail, and

consequently their full play and action are never cramped in any mannerwhatever. This elevation also prevents the coils chafing upon andwearing out the supporting-rail; besides which I secure an immovablepositive abutment to the clinched lower extremities g g by FeIans of thehorizontal bases or prolongations As the coils A A, arms B B, cross-barG, bends E E, projections F F, shanks G G, and clinching portions g gare allcomposed of a single continuous piece of wire, it-will be seenthat the spring and its retaining devices are complete in themselves,and consequently there is no need of extraneous and independent screws,staples, saddles, or other expensive attachments, which are liable towork loose, and

frequently become lost. The extensions F F! G G retain the springsecurely and immovably in the most effective position to secure thedurability and'efficiency of the device.

In manufacturing the bed-bottom the shanks G G are inserted in the holesh and driven down until the bases F F rest upon the upper surface of therail H, after which these bases are placed upon an anvil, and theprotruding ends of shanks G clinched, as previously de-i scribed. Itwill be seen that this method of manufacturing the bed-bottom is verysimple and expeditious, and that the springs are all attached to therails in aperfectly uniform and secure manner. The proportions of bendsE maybe governed by the length of the arms B, the bends being projecteda greater distance forward as said arms are lengthened, and'viceVGI'SEt.

If preferred, the lower ends of the vertical shanks G G may bescrewethreaded, and nuts employed instead of the clinched portions 9 gfor securing the springs on the rail. The bases F F serve as unyieldingabutments to receive the strain or compression brought to bear up on theshanks in clinching or screwing them to the supporting-rail H.

rated supporting-bars H h, for the purpose specified.

In testimony of which invention I'hereunto set my hand.

Witnesses:

GEO. H. KNIGHT, JAMES H. LAYMAN.

M. M. MURRAY. Y

